The Teac UD‑507 is a high-end reference-class USB DAC, headphone amplifier, and preamplifier positioned in Teac’s redesigned 500 Series with 700 Series DNA. Its compact footprint (A4-size chassis) houses premium audio engineering, offering versatile connectivity, elevated performance, and high current headphone driving capability.

Details

At its core is Teac’s proprietary TRDD5 discrete DAC, delivering expansive soundstage and precise imaging. The dual-monaural headphone amplifier uses TEAC-HCLD2 high-current line driver circuitry, producing up to 1 200 mW per channel (balanced into 100 Ω), sufficient for most demanding headphones. Gain is selectable (Low/Mid/High), optimising matches for various headphone sensitivities and impedances.

The unit functions as a full-featured preamplifier with five digital inputs (USB‑C front, USB‑B rear, coaxial, optical, Bluetooth) and two analog inputs (RCA, balanced XLR). Analog volume control is handled by the TEAC-QVCS high-precision attenuator, offering ultra‑fine 0.5 dB steps. Support for MQA decoding, DSD up to 22.5 MHz, and PCM up to 384 kHz enables wide-format playback flexibility. A 10 MHz external clock input supports master-clock synchronization.

Features

• Proprietary TRDD5 discrete DAC designed for musical clarity and spatial depth
• Fully balanced dual-monaural headphone amplifier with TEAC-HCLD2 drivers—up to 1 200 mW/channel into 100 Ω
• Selectable gain (Low/Mid/High) for compatibility with 16–600 Ω headphones
• Five digital inputs: USB‑C, USB‑B, coaxial, optical, Bluetooth (supports LDAC™, aptX™ HD, AAC)
• Two analog inputs: balanced XLR and unbalanced RCA, with Quad Volume Control System (QVCS)
• MQA full decoding (all digital inputs except Bluetooth)
• RDOT‑NEO up‑sampling to 2×, 4×, or 8× sampling rate for PCM
• 10 MHz external clock input (BNC) for high-precision synchronization
• Headphone outputs include 6.3 mm TRS jack, 4‑pin XLR, and 4.4 mm Pentaconn—switchable balanced or active-ground output
• Class‑A/B line outputs (balanced and unbalanced) with fixed or variable level options

Specifications

• DAC: TRDD5 discrete design, DSD up to 22.5 MHz, PCM up to 384 kHz/32‑bit
• Digital inputs: USB‑C (front), USB‑B (rear), coaxial RCA, optical (Toslink), Bluetooth 4.2 with LDAC, aptX™ HD, AAC
• Analog inputs: Balanced XLR, unbalanced RCA
• Analog outputs: XLR balanced (0 dB=2 Vrms, +6 dB=4 Vrms), RCA unbalanced (2.0 Vrms)
• Headphone outputs: 6.3 mm TRS, 4‑pin XLR, 4.4 mm Pentaconn (switchable balanced/active ground)
• Maximum headphone output: 1 200 mW + 1 200 mW balanced into 100 Ω; 900 mW + 900 mW unbalanced into 32 Ω
• Supported headphone impedance: 16–600 Ω
• Volume control: TEAC‑QVCS high-precision attenuator (0.5 dB steps)
• Clock input: BNC 10 MHz external clock support
• Performance: 5 Hz–70 kHz frequency response; THD ≤ 0.01% (1 kHz); S/N ≥ 105 dB (A-weighted)
• Power supply: AC 120 V/60 Hz or AC 220–240 V/50 Hz; 18 W typical (0.4 W standby)
• Dimensions (W×H×D): 290 × 85 × 249 mm
• Weight: 4.9 kg